PRLB insider files Form 144 to sell shares

PRLB-affiliated individual reported proposed sales of Common Stock under Form 144.

Rhea-AI Filing Summary

PRLB-affiliated individual reported proposed sales of Common Stock under Form 144. The filing lists recent open-market disposals totaling specific transactions and multiple issuances from option exercises and restricted stock vesting recorded as issuable securities.

The filing names Michael Kenison as a seller with reported past three‑month sales on including 7,433 shares for $522,011, 200 shares for $14,000, and 5,000 shares for $332,315. The document also lists several option exercises and restricted stock vesting events with explicit share counts.

Insights

Corporate Governance Analyst

Form 144 filing documents reported insider disposals and multiple equity issuances.

The filing records sales by Michael Kenison in the past three months, showing concrete transaction sizes and proceeds. It also enumerates share amounts tied to option exercises and restricted stock vesting, which are listed as issuable or issued under registered plans.

These items are routine compliance disclosures of planned or completed dispositions and compensatory issuances. Subsequent regulatory filings may clarify timing or whether planned dispositions occur under brokered transactions; cash‑flow treatment is specified per transaction lines when present.

Key Figures

Sale — 05/11/2026: 7,433 shares Sale — 05/07/2026: 200 shares Sale — 02/17/2026: 5,000 shares +2 more

5 metrics

Sale — 05/11/2026 7,433 shares proceeds reported as $522,011

Sale — 05/07/2026 200 shares proceeds reported as $14,000

Sale — 02/17/2026 5,000 shares proceeds reported as $332,315

Options exercisable (example) 4,042 shares listed as "Exercise of options under a registered plan" dated 05/12/2026 (context only)

Restricted stock vesting (example) 3,490 shares listed as vested under a registered plan dated 02/13/2026 (context only)

Key Terms

Form 144, Restricted stock vesting, Exercise of options

3 terms

Form 144 regulatory

"144: Securities Sold During The Past 3 Months"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Restricted stock vesting financial

"Restricted stock vesting under a registered plan"

Restricted stock vesting is the timetable and conditions under which shares granted to employees or insiders become fully owned and can be sold, typically requiring continued work or meeting performance goals. It matters to investors because large blocks of shares can become tradable at once, which can change share supply and price, and because vesting aligns insiders’ incentives with the company’s long‑term performance—think of it like a timed unlock that both rewards and locks in key people.

Exercise of options financial

"Exercise of options under a registered plan"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did PRLB's Form 144 disclose about recent insider sales?

It discloses specific sales by Michael Kenison: 7,433 shares for $522,011, 200 shares for $14,000, and 5,000 shares for $332,315. The filing lists these transactions with their trade dates and proceeds.

Who is the reported seller in the PRLB Form 144 filing?

The filing names Michael Kenison as the reporting seller, including his street address and multiple transactions reported with dates and share amounts in the excerpt provided.

Does the filing show additional securities issuable to insiders?

Yes; it lists multiple equity issuances tied to option exercises and restricted stock vesting, with explicit share counts such as 4,042, 1,928, and 3,490, among others.

Are the option exercises and RSU vestings in the filing sales or issuances?

They are listed as equity issuances from exercises and restricted stock vesting under registered plans, with share counts and the method (e.g., Cash, Services Rendered) shown in the excerpt.

How does Form 144 relate to actual market sales of PRLB shares?

Form 144 reports proposed or planned dispositions by affiliated persons; the filing lists completed past transactions and planned sales, but actual execution details depend on subsequent broker reports and trade confirmations.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/12/2026 - 04:18 PM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001870293
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	PROTO LABS, INC.
SEC File Number	001-35435
Address of Issuer	5540 Pioneer Creek Drive Maple Plain MINNESOTA 55359
Phone	763-479-3680
Name of Person for Whose Account the Securities are To Be Sold	MICHAEL R KENISON
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	16030	1113915.08	23794045	05/12/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	05/12/2026	Exercise of options under a registered plan	Issuer			4042	05/12/2026	Cash
Common	05/12/2026	Exercise of options under a registered plan	Issuer			1928	05/12/2026	Cash
Common	05/12/2026	Exercise of options under a registered plan	Issuer			1557	05/12/2026	Cash
Common	05/20/2021	Restricted stock vesting under a registered plan	Issuer			443	05/20/2021	Services Rendered
Common	02/13/2026	Restricted stock vesting under a registered plan	Issuer			3490	02/13/2026	Services Rendered
Common	02/25/2026	Restricted stock vesting under a registered plan	Issuer			1240	02/25/2026	Services Rendered
Common	02/13/2025	Restricted stock vesting under a registered plan	Issuer			1630	02/13/2025	Services Rendered
Common	02/13/2023	Restricted stock vesting under a registered plan	Issuer			607	02/13/2023	Services Rendered
Common	02/13/2024	Restricted stock vesting under a registered plan	Issuer			1093	02/13/2024	Services Rendered

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Michael Kenison 5540 Pioneer Creek Drive Maple Plain MN 55359	Common	05/11/2026	7433	522011.00
Michael Kenison 5540 Pioneer Creek Drive Maple Plain MN 55359	Common	05/07/2026	200	14000.00
Michael Kenison 5540 Pioneer Creek Drive Maple Plain MN 55359	Common	02/17/2026	5000	332315.00

144: Remarks and Signature

Remarks
Date of Notice	05/12/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Michael Roy Kenison
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)